Vibrator support with multistage noise attenuation



C. HUETTEN ET AL Filed June 29, 1949 VIBRATOR SUPPORT WITH MULTISTAGE NOISE ATTENUATION July 1, 1952 Patented July l, 1 952 vNo1,si;f iifr'rENUATION Clarence Huette i a Delaware* ,t

Appiiaepn Lurieze, 19491, 'serrait-i0... 02,064

E This intent-'ion relates to asupportjiornvibra- `tory motors and has specific application to such 'apparatus including means and methods `foreubstantially eliminating vibrationsl `transmitted fromla vibratingunit through suchA a support;

` In power supplies for radio sets, and for other purposes,. wherein a storage battery or other low Yvoltage vcurrent 'sources are utilize d, it is com'- monpractice to provide avibratory motor for periodically interruptingr the currentproduced by a direct current` source to r'alternatily energize sections of a center-tapped primary winding. The alternating'primary current thusestablished across a primary Winding is then stepped up by fthe associated transformer and appears across a slecondarythereof atten-WhichA itmay'be recti- 'edand usedas a high voltage power supply for the various' tubes and' otherA-electrical'compo- Vrients and apparatus.

When utili'zingsuch vibrators forthe purposes stated as above, the vibrations ofthe moving -parts of the vibrator, as for example, the'reed and other vibratingflparts, bothy of a mechanical and acoustical nature,v are often times trans'- vmittedi through I.thezvibrator support to an assofciatedpparatus such` as a radioset establishing undesirable oscillationsand noise characteristics therei n Fu rther, 'this' noise, being 'coupled gto electronicl discharge vcircuits mayv 1be ;1amplied considerablyfand.uliimatelyprqve t0 bf2-:refr desirable and highly deleterious i ;h e satisfactory operation of thi-iassociated.equipment.1

. .fljhusany means whichmay prove vefiectivedri `vsubstantially lessening theopportunities for ..u n @desirable noise; characteristics from being fed into electronicor. electrical circuits of aaradio system,v etc., and which consequently .interferes `withzthe optimum operation of such a-systemfis v.a greatly desired achievement and makes for considerable advance inthe arts of intelligence communication l Y V- Means-have been proposed for attenuating these undesirable ,vibration characteristics; and

Snoise,`such\as by providing, a shielding-element :sof-as lto reduce the mechanicaland .acoustical "vibrations of thereedv component ofthe vibrator. :Moreovenv a. vibrator 'that is f stillv considerably more quiet than the*quietestfnormalvibrator now presently' produced is', indeed` desirable, since,. as

automobiles anclautomobileradios become imprve'd'in quality, the need forquieter vibrators has become increasingly apparent.;

BY means of the present nvention-.of aA-lnovel lvibrator* support `for including saidvibr-ator; at-

tenuation means have been provided for substancomms.- (Cisano- 168) transmitted vibrations through the vibrator support. At the Sametime, the double and completeuenclofsures"substantially and drastically re- .f'du'ce airborne l`noise emanating from the viiifair- It isf, therefore, a prime object of the present invention to provide a novel vibrator support hav- "ingj a multi,stage noise attenuation characteristic for` substantially lessening and eliminating mechanicalvibratory and acoustical noises from affecting the operation of communicators or radio apparatus.

Still anotlierobject'of the present invention is ft'o providev a vibrator in which both mechanical 7 and ".adoustical vibrations Vare substantially les- Lsenjed andieliminated thus providing noise free toperationof communicators vor radio apparatus. Still another object of the present invention'is toproyideanoise-reducing device having the vcliaracteristics oft a two-stage low pass mechanpar filter. l

Yet another object of the present invention is toprovide' a novel vibrator support wherein un- 'desirable noise and oscillation characteristics v rn'aylcue'substantially lessened by providing dual compliant vibrator mountings individually and separately circumscribed by rigid containers.

. The invention, in another of its aspects, relates vtolnovel features ofthe instrumentalities described herein for teaching the principal objects Q` the ,invention and to the novel principles ernployedin thoseinstrumentalities Whether or not Vthese' features and principles may be used in the saidgobjects and/or in the said eld.

Y, f .qOther objects ofthe invention and the nature thereof will become apparent from the following description considered in connection with the acfcompanying'gures vof vthe drawing wherein like areference'icharacters describeelements of similar a=functionfand lwhereinfth'e scope of the invention isidetermined .from .the .appended claims.

'Referring to the figures of the drawing:

Figure 3 is an illustrative View of the novel on c piece ielt liner compliant structure used in'.V the complete vibratory assembly. y Although a preferred embodiment of; the 1n.-

vention is described herein, it, is contenlplatezl4 that considerable variation. may be; made in the method of procedure and the construction of parts without departing from the, spirit of the invention. In the followingV description and' in the claims, parts will .be identified byspecific names for convenience.

Generally speaking, the multi-stage attenuator vibrator support ofV the present. invention comprises a vibrator element Supported in a compliant medium I I which is completely enclosed by a rigid container element I2 to form a single stage attenuator and/or low pass lter. This single stage filter or attenuator is enclosed, in turn, as by means of a second compliant medium I3 further enclosed by a second rigid container i5. By this novel construction and arrangement of parts, a two-stage low pass mechanical nlter is cooperatively fabricated so as to substantially completely attenuate transmitted vibrations and noises passing through the vibrator support, while at the same time drastically reducing and lessening air-borne noise.

In Figure 1, the vibratory unit or motor generally designated as I0, may include an L-shaped frame 2B having, at one end thereof, a. pole piece ZI. Mounted on pole piece 2I` is a coil 23 suitably adapted to be energized by a. source of direct current. A stack 24 is secured to the other end of a frame, as by means of screw members 25. This stack consists of a plurality of insulating spacers between which are mounted the vibratory reed and contact structure of the vibrator..n Such structure has been described in co-pending application Serial No. 2,106 for a Vibrator Support, led on January 13. 1948, by Huetten et al., `now PatentNo. 2,513,940, dated July 4, 1950.

port structure 38 as by molding. This is done by having the compliant structure 30 molded Within a form containing cardboard tube 50, and while the rubber socket is being formed a limited circumferential inner region of the compliantV structure is molded to or adhered to the outer surface of cardboard `tube 50.'

a base .'34 integral with compliant structure 30 maybe molded' to form .a seatV structure 35having an inclined section 36, 'a 'connecting section 3l and a leg section; ha'ving asteel ring' 4I) interposed betweensections 34 and 38. Contiguous with and circumscribing said compliant structure 30 is a rigid container I2 which may be metallic in construction and Vwhich may be crimped so as to intimately conform to base 34 of compliant structure 30. Circumscribing said rigid container is a second compliant cup-shaped structure or sleeve I3. Y

Compliant sleeve member or liner "I3 may be fabricated of felt andl may be made in a unitary manner from a single piece of flat stock. It comprises two substantially rectangular end portions 1.0; andi-1I, interconnected by means of an integrallyformed center section 'I2 having a substantially, annular or disc-like configuration. Thuain contradistinction to the usual complex arrangement of a disc and wrap around piece which is diicult to assemble, liner I3 is made in one piece and is expeditiously and simply assembled byV merelyinserting it within its circumscribing rigid container. Concentrically iitting over sleeve or lining I3 is a second rigid container I4 which may be suitably crimped in constructiond to aiord optimum sealing as by means of sections 5I, and 52 gripping and including, an insulator 53. As shown in Figure 1 and as stated previously in thev specification, the sealing of the second rigid container I4 is. eiectuated by an insulator 53, which is separated from base 34 of the first container so that a space exists therebetween. The double and complete enclosures thusinclude the space which exists between base 3.4 and insulator 53. of the. second container whereby air-borne noise emanating from the vibratorV is substantially. and drastically reduced. In this manner a two stage low passy mechanical filter is constructed whereby means of alternate compliant and rigid assemblies, a two-stage noise attenuator and/ or filter is provided whosesimple and novel construction substantiallyy eliminates and precludes vibratory.V noises from the vibrator section, per se, from affecting subsequent associated apparatus.

The novel vibrator support with multi-stage noise attenuation, as described above, is merely illustrative and not exhaustive in scope and since many widely different embodiments; of'.` the invention may be made without departing from the scopethereo'f, itis intendedv that all matter contained in the above description and shown in 'ing means including bottom insulator means separated from` said. first rigid container by a substantial air space existing between Ythe bottom ot'said rigid container and the bottombfrsaid .filtering means,v said filtering means beingconcentri'callytted over said compliant sleeve, plug means joined to said insulator means. and aplurality ofconductors connecting said plug means to said vibrator, said; conductors thus providing a` noating support for said: vibrator and whereby a substantially two-stage low pass'noiseviilter is constructed substantially precluding Vnoise of `said vibrator from affecting apparatus coupled thereto.

2. Apparatus as in claim 1, wherein said sleeve of said first-named compliant means is made of a sponge rubber material and said second ltering means includes a felt sleeve concentrically tted over said rigid container.

3. A multi-stage noise attenuating vibrator support comprising in combination, vibrating means, a compliant medium including an insulator tube, a rubber sleeve connected thereto circumscribing said vibrating means, a rigid container having a bottoni enclosing said compliant medium, a second compliant medium having a bottom separated from the bottom of said rigid container by a substantial air space, said second compliant medium adapted to surround said rigid container, container means enveloping said vibrator and said second compliant medium, a plug connected to said second container means, and a plurality of conductors interconnecting said plug and said vibrator to support the latter whereby vibration effects from said vibrator are substantially eliminated and prevented from passing to the outside.

4. A two-stage low pass mechanical filter for preventing vibration from being transmitted through a vibrator support comprising; a first lter including vibrating means for converting a direct current voltage to a pulsating direct current voltage, sponge rubber compliant means, an insulator tube surrounding said vibrator means, said sponge rubber means including one section adapted to support said tube surrounding said vibrating means and further having a frustoconical shaped section integrally formed therewith, rigid container means enveloping said compliant means, said rigid container means being crimped; and a second filter comprising a second compliant sleeve completely enveloped by a crimped rigid container, said crimping of said rigid container being adapted to grip an insulating plug structure separated from said iirst rigid container means by a substantial air space, and a plurality of conductors interconnecting said insulating plug means and said vibrating means to support the latter thereby and to preclude noise from said vibrating means from aiecting electrical circuit components connected to said plug means.

5. Apparatus as in claim 4, wherein said second compliant sleeve is fabricated of a single piece of flat stock, said piece including two substantially rectangular portions connected by an annular shaped center section.

6. A vibrator noise attenuating means for attenuating operating noises comprising in combination, a vibrator mechanism for converting a direct current voltage into a pulsating direct current voltage, means for compliantly mounting said vibrator, said means including an insulator tube and a rubber structure surrounded by a metal can having a bottom, second compliant means having a bottom enveloping said vibrator and being disconnected therefrom by a substantial air space existing between its bottom and the bottom of said metal can, said second means further including a felt sleeve enveloping said vibrating means, a metallic container enveloping said felt means externally thereto, a plug connected to said metallic container, and a plurality of conductors interconnecting said plug and said vibrator mechanism so that the latter is supported by said conductors in a substantially oating manner and whereby a substantially multi-stage low pass iilter is obtained to prevent noise from said vibrator mechanism from aiecting associated apparatus.

7. A noise preventing mechanism adapted for use with means for converting direct current voltage into pulsating direct current voltage, said means including a vibrating reed, a filter cooperatively associated with said vibrating mechanism, said filter including a compliant structure comprising a cardboard insulator tube, said tube having a rubber structure connected thereto with a rigid container circumscribing said latter structure, said rigid container having a bottom thereto, and sound filtering means also having a bottom circumscribing and enveloping said iirst lter, said sound iiltering means being separated from said rst iilter means by a substantial air space existing between the bottoms of said sound filtering means and said rigid container, said second ltering means further including a second compliantstructure and a metallic container enveloping said second compliant structure, a plug connected to said latter metallic container, and a plurality of conductors interconnecting said plug and said vibrating mechanism to support said vibrating mechanism.

8. An apparatus as in claim 7 wherein said metallic containers are crimped for optimum sealing from said vibrating means within said iiltering means.

CLARENCE HUETTEN. JAMES J. KAUFMANN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,265,858 Yocum May 14, 1918 1,510,919 Blank Oct. 7, 1924 2,164,632 Barrett July 4, 1939 2,247,469 Barrett July 1, 1941 2,294,125 Niedermeier Aug. 25, 1942 2,443,037 Huetten June 8, 1948 2,513,940 Huetten et al July 4, 1950 

